The uniq utility reads the standard input comparing adjacent lines and writes a copy of each unique input line to the standard output.
The sec- ond and succeeding copies of identical adjacent input lines are not writ- ten.
Repeated lines in the input will not be detected if they are not adjacent,
so it may be necessary to sort the files first.

Ignore the first fields in each input line when doing compar- isons.
A field is a string of non-blank characters separated from adjacent fields by blanks.
Field numbers are one based,
i.e.
the first field is field one.

Ignore the first chars characters in each input line when doing comparisons.
If specified in conjunction with the -f option,
the first chars characters after the first fields fields will be ig- nored.
Character numbers are one based,
i.e.
the first character is character one.